Figure 8. Plan view of a typical deck arrangement for lowering 



ra and indicating bottom contact. 



Maintenance and Care of Equipment 



To reduce the costs of operation, maintenance, and replacement of parts, metals 

 resistant to salt-water corrosion have been utilized as much as possible. Aluminum parts 

 exposed to salt water are anodized and coated with light-weight silicone oil. In fittings 

 where dissimilar metals come into direct contact, frequent rinsings with fresh water and 

 periodic applications of silicone oil are made. The useful life depends directly upon 

 the attention given to such maintenance. 



Willard wet cells employed in the Illumination unit are given normal battery care 

 and kept in a clean, charged condition. When not in use the cells are removed from the 

 battery compartment of the unit and stored in a charged condition in a safe location 

 where they can be recharged and observed for the need of additional electrolyte. The 

 22'/2-volt dry cell in the BC unit which activates the camera shutter solenoid is replaced 

 periodically when in constant use or when its tested voltage drops below normal operat- 

 ing requirements. Silica gel from the compartment located on the base of the camera 

 and power-supply unit is removed and dried periodically to provide maximum protection 

 from moisture resulting from condensation. The 35-mm robot camera when not in use 

 is stored in a moisture-free container to keep it operable. Excessive amounts of moisture 

 or lint in the shutter mechanism will cause malfunction of vital parts. Maximum illumina- 

 tion from the flash tube requires a polished reflector (aluminum, in this case). The clear 

 plastic flash-tube envelope is cleaned carefully to guard against excessive scratching 

 which weakens the plastic and impairs the optical properties. "O" rings are checked 

 periodically for scratches and flattening and renewed when defects are detected to insure 



